Well according to my Dentist, this is what happened to my tooth. At some point when I was a child and my teeth were forming, I had a fever which affected the enamel. The enamel is the protective coating and there were spots on several places in a few of my teeth that the coating didn’t form. That made the tooth susceptible to decay

god knows
I’m 16, and i have 9!!! cavities 9!!!! although i do smoke, i don’t eat or drink much sugery food anymore
and my teeth are constantly getting compliments from people, so they don’t look awful, but looks can be decieveing
i brush daily and use mouthwash
just unlucky i suppose

what kinda cavity u got ..??
well … in general .. Oral Hygiene defers form one to another ..
in some cases .. a person don’t brush his teeth and don’t care about them .. but he got a good oral hygiene ..
and in the other hand .. you may see someone who is an oral-cleaning maniac .. but still his oral hygiene is bad ..
its something effected by the genes ..

as my dentist says, if you eat eventually you’re teeth will need attention. sometimes you just get decay and theres nothing you can do about it, of course other then stop eating. lol

Genetics has a lot to do with it too!
My brother in law takes fantastic care of his teeth and they look great but every once and awhile he’ll get a cavity or something. Genetics man….